-79.72% is the change from 636 to 129
Calculation steps:
[( 129 - 636 ) ÷ 636] x 100 = -79.72%
Formula
Percentage change = [(129 - 636) / 636] x 100
Subtract the new number by the original number
129 - 636 = -507
-507 ÷ 636 = -0.7971698113207547
-0.7971698113207547 x 100 = -79.72%